Mechanical coupling



FIG. 1 is a perspective view of an embodiment of our design for a pipe coupling;

FIG. 2 is an end view of the pipe coupling shown in FIG. 1, the opposite end view being identical thereto;

FIG. 3 is a side view of the pipe coupling shown in FIG. 1, the opposite side view being identical thereto;

FIG. 4 is a top view of the pipe coupling shown in FIG. 1; and,

FIG. 5 is a bottom view of the pipe coupling shown in FIG. 1.

The broken lines shown in FIGS. 1–5 are shown for illustrative purposes only and form no part of the claimed design. 

We claim the ornamental design for a mechanical coupling, as shown and described. 